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针对高超声速飞行器再入过程的姿态跟踪要求,提出了基于扩张状态观测器(ESO)的模糊自适应姿态控制策略。在反步法框架下,对于姿态角动态,采用模糊自适应在线逼近耦合不确定性。为减轻计算负担,设计ESO在线观测角速率动态中由于参数摄动和输入扰动引起的综合不确定项。为避免反步控制的“微分爆炸”现象,使用动态面方法设计姿态控制器。基于Lyapunov理论的稳定性分析,证明了闭环控制系统是半全局一致最终有界的。仿真结果表明,该方法对于高超声速飞行器姿态角信号指令具有良好的跟踪性能。
Aiming at the attitude tracking requirements of hypersonic vehicle reentry process, a fuzzy adaptive attitude control strategy based on extended state observer (ESO) is proposed. In the framework of the backstepping method, the fuzzy uncertainties are approximated online by fuzzy adaptive method for attitude angle dynamics. In order to reduce the computational burden, we design the comprehensive uncertainties caused by parameter perturbation and input perturbation in the angular velocity of the observed ESO. To avoid the “differential explosion” phenomenon of backstepping control, a dynamic surface method is used to design the attitude controller. Based on the stability analysis of Lyapunov theory, it is proved that the closed-loop control system is semi-globally uniform and ultimately bounded. The simulation results show that this method has good tracking performance for hypersonic vehicle attitude angle signal.